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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 2
 1
 8
 4

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Electrical Machines
What is the highest possible speed of turbo alternators?

 1000 rpm
 1500 rpm
 3000 rpm
 4000 rpm

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
 50 ohm.
 100 ohm.
  0.5 ohm.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 20 V.
 60 V.
 0 V.
  40 V.

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Electrical Machines
In DC machine shape of main field flux distribution is?

 saddle shape
 flat tapped or trapezoidal
 peaky in nature
 triangular

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 2 at 90°C.
  1 at 90°C.
 3 at 90°C.
 0.5 at 90°C.

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